fix: skip response_format parameter for MiniMax models

MiniMax API does not support the response_format parameter with
json_object type, causing 400 errors. Added model name detection
to conditionally skip this parameter for MiniMax models.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/app/services/oasis_profile_generator.py

@@ -527,16 +527,21 @@ class OasisProfileGenerator:
         
         for attempt in range(max_attempts):
             try:
-                response = self.client.chat.completions.create(
-                    model=self.model_name,
-                    messages=[
+                # MiniMax 不支持 response_format 参数，跳过
+                kwargs = {
+                    "model": self.model_name,
+                    "messages": [
                         {"role": "system", "content": self._get_system_prompt(is_individual)},
                         {"role": "user", "content": prompt}
                     ],
-                    response_format={"type": "json_object"},
-                    temperature=0.7 - (attempt * 0.1)  # 每次重试降低温度
+                    "temperature": 0.7 - (attempt * 0.1)  # 每次重试降低温度
                     # 不设置max_tokens，让LLM自由发挥
-                )
+                }
+
+                if "MiniMax" not in self.model_name and "minimax" not in self.model_name:
+                    kwargs["response_format"] = {"type": "json_object"}
+
+                response = self.client.chat.completions.create(**kwargs)
                 
                 content = response.choices[0].message.content
                 

backend/app/utils/llm_client.py

@@ -58,7 +58,8 @@ class LLMClient:
             "max_tokens": max_tokens,
         }
         
-        if response_format:
+        # MiniMax 不支持 response_format 参数，跳过
+        if response_format and "MiniMax" not in self.model and "minimax" not in self.model:
             kwargs["response_format"] = response_format
         
         response = self.client.chat.completions.create(**kwargs)